No prosecuting officer shall receive any fee or reward from or in behalf of a prosecutor for services in any prosecution or business to which it is his official duty to attend, nor shall he be concerned as counsel or attorney for either party in a civil action depending upon the same facts involved in such prosecution or business.
Mass. Gen. Laws ch. 12, § 30
Fees for services in performance of duty; appearance in civil action
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.